A look at the brutal Zetas cartel

With the arrest of the leader of the Mexican drug cartel, Los Zetas, renewed attention is being put on the brutal gang.

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Colombian police director Jose Roberto Leon Riano (L) shows a 5.56 FN Herstal assault rifle seized in the house where Erikson Vargas, a.k.a. Sebastian, alleged drug gang leader of "La Oficina de Envigado" was captured early this week, near Medellin (northeast), in Girardota municipality, Antioquia department, Colombia, on August 9, 2012. Sebastian, who took command of the drug gang after the arrest of Maximiliano Bonilla - a.k.a. Valenciano - in Venezuela last November, and is pointed to maintain alliances with Mexican cartel "Los Zetas" will be extradited to the US, Colombian President Juan Manuel Santos said.

RAUL ARBOLEDA/AFP/Getty Images

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Colombian police director Jose Roberto Leon Riano (L) shows a 5.56 FN Herstal assault rifle seized in the house where Erikson Vargas, a.k.a. Sebastian, alleged drug gang leader of "La Oficina de Envigado" was captured early this week, near Medellin (northeast), in Girardota municipality, Antioquia department, Colombia, on August 9, 2012. Sebastian, who took command of the drug gang after the arrest of Maximiliano Bonilla - a.k.a. Valenciano - in Venezuela last November, and is pointed to maintain alliances with Mexican cartel "Los Zetas" will be extradited to the US, Colombian President Juan Manuel Santos said.